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AQA GCSE CHEMISTRY (9-1)
Quantitative Chemistry
Moles and Mass
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Cards (17)
What does the term "
mole
" refer to in
chemistry
?
A unit used to measure the
amount
of chemical
substance
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How is the mole similar to other units of measurement like meters and seconds?
It measures the amount of substance, just as
meters
measure distance and
seconds
measure time
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How many particles are contained in one mole of a substance?
02
times 10 to the
23
particles
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What types of particles can be referred to as "particles" in the context of moles?
Atoms
, molecules,
ions
, or electrons
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If you have one mole of carbon, how many atoms of carbon do you have?
02
times 10 to the
23
atoms of carbon
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What is Avogadro's constant?
It is the number of particles in one mole, which is
6.02
times 10 to the
23
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Why is Avogadro's constant significant in chemistry?
Because the mass of that many particles of any substance equals its
relative atomic
or
formula mass
in grams
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What is the weight of one mole of carbon dioxide (CO2) with a relative formula mass of 44?
44 grams
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How can you calculate the number of moles in a sample?
By
dividing
the mass of the element or compound by its
relative formula mass
(mr)
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If you have 42.5 grams of ammonia (NH3), how many moles do you have?
5
moles
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How do you find the mass of 3 moles of carbon dioxide (CO2)?
Multiply
3 moles by the relative formula mass of CO2, which is
44
grams
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What is the mass of carbon in 3 moles of carbon dioxide (CO2)?
36
grams
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How can you find the mass of oxygen in 3 moles of carbon dioxide (CO2)?
By
subtracting
the mass of
carbon
from the total mass of CO2
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What does a chemical equation represent in terms of moles?
It represents the
ratios
of moles of
reactants
and products
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In the reaction of magnesium with hydrochloric acid, how many moles of hydrochloric acid are needed for 2 moles of magnesium?
4
moles of hydrochloric acid
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How many moles of magnesium chloride are produced from 2 moles of magnesium reacting with hydrochloric acid?
2 moles
of
magnesium chloride
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How many moles of hydrogen gas are produced from 2 moles of magnesium reacting with hydrochloric acid?
2 moles
of
hydrogen gas
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